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In a population of dandelions, a few have genes that result in the production of a bitter chemical compound in the leaves. If the anilms that ususally feed on dandelions refuse to eat the ones with the bitter compound, what will the effect on the "gene frequency" of this gene be after several generations.

increase

In the Miller-Urey experiment, amino acids and organice acids were formed by?

exposing hot water and soem of the gases through to be in atmosphere of the early earth to electric sparks

The first antibiotic that was commonly used on humans was made by??? that used the antibiotic to ???.

fungi, stop bacteria from competing with the fungus for food

Where do the ants that live on a Bullhorn Acacia get their food?

leaf tips and sugar-producing glands on the petioles of the Acacia

An example of the mechanism of evolution is whon by which of the following situations?

The yellow flowers plants in apopulation of yellow and white flowered plants are visited more frequently by bees. After several generations more of the plants have yellow flowers.

Xylem occurs in???

ferns

Paralytic shellfish poisoning makes what kinds of organisms ill?

humans

In animals, most speciation has resulted from

geographic isolation

In a population of dandelions, a few have genes that result in the production of a bitter chemical compound in the leaves. If the animals that ususally feed on dandelions refused to eat the ones with the bitter compound, what will the effect on the "gene frequency" of this gene be after sev. generations?

increase

Bogs are formed by

sphagnum moss

The organisms that cause PSP, DSP and ciguatera poisoning belong to what kingdom?

Protista

Decomposition by fungi is vitally important because of the release of ??? (to the air) that is later used for ???.

carbon dioxide, photosynthesis

The cells in leaves and stems of mosses are

haploid

The young leaf of a fern as it emerges from the ground is called a

fiddlehead

The compound thiaminase has what function in ferns?

discourage herbivores from eatting them

The zygote of a fern is fomred on the lower side of the

gametophyte

A mutation occurs which causes a plant to flower 1 month before the rest of the plants in a population of flowers. This is an example of

reproductive isolation

Ciguatera poisoning can result from eating

fish

A map of the areas of Narr. Bay that are closed to collection of shellfish is printed every day in the newspaper. The main reason for areas being closed to shellfish collection is ???

to prevent outbreaks of hepatitis and other diseases caused by bacteria and viruses in sewage

The murchison meteorite contained:

water, 92 kinds of amino acids and lipids that formed a bi-layer and cell-like spheres when mixed with water

Many purplish structures about one inch long protrude from the stalk that bears the grains of the rye plant. These structures are harvested and ground with the grain into flour. What are some likely affects that may result if you eat bread made from this flour?

burning sensation in skin, hallucinations, gangrene

Birds such as those featured in the movie "the Birds" may exhibit aggressive behavior when they ingest a neurotoxin produced by

algae whose cell walls are composed of silica

Monarch butterflies and caterpillars are protected from their predators by cardiac glycosides that

they obtain pre-formed from feeding on milkweed leaves

When we say that two species are related, we meant that they

evolved from a common ancestor

The first cells formed on earth about ??? years ago.

3.8 billion

When the first cells formed on earth, the earth's atmosphere is now though to have been composed primarily of what gases?

N2 and CO2

Batesian mimicry is shown by which example

some species of non-toxic caterpillars have a coloring similar to that of toxic species of caterpillars

Which of the following is/are haploid?

gametophyte of moss AND gametophyte of fern

Arrange in order from most recent to earliest in earth's history: first photosynthesis, rocks form, first eukaryote, first prokaryote

first eukaryote, first photosynthesis, first prokaryote, rocks form

A single dinoflagellate produces a flash of light that is

blue and lasts for about one second

when a fungus grows in a piece of bread, what substanc made by the fungus breaks down the starch molecules in the bread?

extracellular enzymes

What do the ferns and fern allies have in common?

dominant stage is sporophyte

The evolution of new species is

called speciation

The loss of ??? from corals reults in teh disease known as ???.

zooxanthellae, coral bleaching

Collisions with comets are likely to have been a source of ??? to the young earth.

water and molecules of organic compounds such as formaldehyde adn cyanide

Konzo disease occurs in ??? and is caused by ???.

humans, consumption of improperly processed cassava

A devistating disease that changed world history by destroying the irish potato crop in 1845-1846 was caused by

phytophthora infestans

A plant that grows in bogs and uses long, stalked "tentacles" with a sticky drop of fluid to caputre prety is the ??? which occurs in ???.

sundew, rhode island

compounds that discourage herbivores, are bitter tasting, affect the CNS and are present in Yew are also the major type of toxin in what other plants?

members of the nightshade family (tomato, potato, etc)

The oxygen that is a component of the current atmosphere of the earth originated from